What is navigation tunnel?

A navigation tunnel is an underground passage designed to facilitate the movement of vessels, typically through land or under obstacles like mountains or urban areas. These tunnels often accommodate waterways, allowing ships and boats to bypass obstacles and improve trade and transportation efficiency. In addition to maritime applications, the term can also refer to tunnels used for navigation in various contexts, such as transportation or infrastructure projects. Navigation tunnels are crucial for enhancing connectivity and reducing travel times in congested regions.